Texting problems between iPhone 4 and 3GS

[Anil71]

Hi, this is my first post. I did some searches and haven't seen any similar issues, so here goes:

I bought my wife an iPhone 4 for Xmas. She loves it! However, while she can send regular text messages to her contacts (none with iPhones), when sending texts to my iPhone 3GS she gets the red "!" - message didn't go through. I can send texts to her though.


Maybe its a problem with different iOS? I have version 3.1.2 and she has 5.0.1.

I'm traveling soon, and we use texts a lot to stay in touch - any help would be appreciated.

Cheers.
Anil.

 

[Anil71]

Update - got someone with an iPhone 4 to send me a text to my 3GS - received it fine!

So, the problem must be something to do with my wife's iPhone 4, but for the life of me, I can't think what.